WISE OWL EXERCISES
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SQL | Parameters and return values exercise | Default values in parameters
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
The answer to the exercise will be included and explained if you attend one of more of the courses listed below!
- Go into SQL Server Management Studio;
- Open the SQL file you've just unzipped (you can press CTRL + O to do this); then
- Execute this script.
This will generate the database that you'll need to use in order to do this exercise (note that the database and script are only to be used for exercises published on this website, and may not be reused or distributed in any form without the prior written permission of Wise Owl).
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Create a stored procedure called uspContinentEvents which filters events to show only those:
- which took place in a given continent;
- which took place on or after a given date; and
- which took place on or before a given date.
When you run your procedure, it should show something like this:
These results are for events in Asia between '1990-01-01' and '2000-01-01'.
You can use the LIKE clause to show all events whose continent name contains the parameter value you pass in.
Now try running uspContinentEvents without any values for the parameters. You should get an error:
The error you'll get when you run your procedure without passing any parameters in.
Unless you are using default values, all parameters must have a value. Set default values for each parameter to be the widest range that you can:
Re-running the stored procedure with the widest defaults should result in 459 rows being returned.
Optionally save this as Defaulting is never wise.sql and close it down.